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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 644 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.19² =
  2. 2.61² =
  3. 3.51² =
  4. 4.29² =
  5. 5.29² =
  6. 6.29² =
  7. 7.91² =
  8. 8.59² =
  9. 9.41² =
  10. 10.89² =
  11. 11.19² =
  12. 12.71² =
  13. 13.69² =
  14. 14.81² =
  15. 15.29² =
  16. 16.21² =
  17. 17.61² =
  18. 18.69² =
  19. 19.69² =
  20. 20.81² =
  21. 21.79² =
  22. 22.51² =
  23. 23.79² =
  24. 24.31² =
  25. 25.49² =
  26. 26.29² =
  27. 27.31² =
  28. 28.31² =
  29. 29.69² =
  30. 30.31² =
  31. 31.79² =
  32. 32.59² =
  33. 33.91² =
  34. 34.39² =
  35. 35.31² =
  36. 36.89² =
  37. 37.69² =
  38. 38.49² =
  39. 39.79² =
  40. 40.89² =

Answer key

  1. 361
  2. 3721
  3. 2601
  4. 841
  5. 841
  6. 841
  7. 8281
  8. 3481
  9. 1681
  10. 7921
  11. 361
  12. 5041
  13. 4761
  14. 6561
  15. 841
  16. 441
  17. 3721
  18. 4761
  19. 4761
  20. 6561
  21. 6241
  22. 2601
  23. 6241
  24. 961
  25. 2401
  26. 841
  27. 961
  28. 961
  29. 4761
  30. 961
  31. 6241
  32. 3481
  33. 8281
  34. 1521
  35. 961
  36. 7921
  37. 4761
  38. 2401
  39. 6241
  40. 7921

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